LU-8289 utils: fix ll_decode_linkea doc

LU-8289 utils: fix ll_decode_linkea doc

Arguments "#123451" and "#123452" in example were hidden by "\".

Test-Parameters: trivial
Signed-off-by: Sohei Koyama <skoyama@ddn.com>
Change-Id: I059abac920fcc5ecfe03eddc00fef1dd6d89db27
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58128
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Frederick Dilger <fdilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>